当 DialogFragment 打开时，如何捕获后退按钮按下？

Question

用户可以单击 DialogFragment 的“取消”按钮或屏幕上的“确定”按钮或设备上的后退按钮。取消和确定按钮的代码工作正常。单击后退按钮时，目标是关闭（关闭）DialogFragement 并返回到上一个活动。我的后退按钮代码不起作用，请告知。

public class CreateSkycardFragment extends DialogFragment {

public CreateSkycardFragment() {
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.skyfrag_layout, container, false);
    getDialog().setTitle("Delete skycard");


    // if the user clicks "Cancel" in the "Delete skycard" dialog.
    Button btnCancel = (Button) rootView.findViewById(R.id.btnCancel);
    btnCancel.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            InputMethodManager imm = (InputMethodManager) getActivity().getSystemService(CardViewActivity.INPUT_METHOD_SERVICE);
            imm.toggleSoftInput(InputMethodManager.SHOW_IMPLICIT, 0);
            getDialog().cancel();
        }
    });

    // if the user clicks "OK" in the "Delete skycard" dialog.
    Button btnOK = (Button) rootView.findViewById(R.id.btnOK);
    btnOK.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            dismiss();
            getActivity().finish();
        }
    });

    // if the user presses the Back Button even with the "Delete skycard" dialog open.
    // the below code is where I'm having trouble
    .setOnBackPressListener(new OnBackPressListener() {
         @Override
         public void onBackPressed() {
             dismiss();
             getActivity().finish();
         }
    });
    return rootView;
}

}

Answer 1

可能是这样的吗？试一下。覆盖片段中的 onKeyDown。

public boolean onKeyDown(int keyCode, KeyEvent event) {

    switch (keyCode) {
        case KeyEvent.KEYCODE_BACK:
            //Your code
            return true
}
        return false;

}